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The line x cos alpha + y sin alpha +y...

The line x cos `alpha + y sin alpha +y sin alpha =p` is tangent to the ellipse `(x^(2))/(a^(2))+(y^(2))/(b^(2))=1.`if

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The correct Answer is:
`a^(2) cos^(2) alpha+ b^(2) sin^(2)+ alpha= p^(2), ((a^(2) cos alpha)/(p),(b^(2) sin alpha)/(p))`
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